Acta Cryst. (2006). E62, o4917-o4918  [ doi:10.1107/S1600536806037998 ]

2-(2,6-Dimethyl-4H-pyran-4-ylidene)malononitrile

X.-S. Fu, M.-J. Zhou, J.-W. Sun and D.-D. Xiao

Online 13 October 2006

Key indicators

• Single-crystal X-ray study
• T = 294 K
• Mean (C-C) = 0.004 Å
• R factor = 0.057
• wR factor = 0.193
• Data-to-parameter ratio = 20.5

checkCIF/PLATON results

No syntax errors found




Alert level B
PLAT021_ALERT_1_B Ratio Unique / Expected Reflections too High ...       1.34      

Alert level C
PLAT030_ALERT_1_C _diffrn_reflns_number .LE.  _reflns_number_total          ?
PLAT230_ALERT_2_C Hirshfeld Test Diff for    C5     -   C7      ..       5.94 su   
PLAT371_ALERT_2_C Long   C(sp2)-C(sp1) Bond  C5     -   C6     ...       1.42 Ang. 

   0 ALERT level A = In general: serious problem
   1 ALERT level B = Potentially serious problem
   3 ALERT level C = Check and explain
   0 ALERT level G = General alerts; check

   2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   2 ALERT type 2 Indicator that the structure model may be wrong or deficient
   0 ALERT type 3 Indicator that the structure quality may be low
   0 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

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